I thought you had been battling a transmission oil pan leak ... sounds like you are describing the engine oil pan. If its the engine oil pan, these must be aligned with the rear block "face" or machined surface - within a fairly tight tolerance - or they will leak and / or cause stress on the transmission input shaft. Its a challenging task with the drivetrain in the vehicle.
Some people will "eyeball" this, others use feeler gauges - I have done both, put prefer to use the proper alignment tools whenever possible.
Regards,
Taz
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